This is based on Rob's drum tracking schedule, meaning they were working on a new version but may not have finished it, it may have been dropped from the track list early on and it never even got to any intermediate version.
There's one thing that's always been confusing to me: Why did the band make new demos of Part Of Me and Carousel when they had good EP versions? The later demos sound much weaker and less polished in terms of the mix. Meanwhile, the And One demo has been going from disc to disc completely unchanged. It's like they didn't have multitracks of the songs from that EP, and they couldn't change the parts like they did with the demos that originally featured Mark singing, and they basically replaced the vocal takes. So it's like they re-created those HTEP tracks (Part of Me, Carousel, and High Voltage too).
And another interesting detail, also concerning these tracks and not only: Chester's vocals on HTEP sound most similar to the vocals in HT, but on all the demos between them - it sounds completely different, as if it were more like how Mark sang (bright examples - Untitled, Esaul, Rhinestone, Carousel, Part Of Me, Crawling, Slip, etc.) - the vocals are very "fuzzy" and not so powerful. Maybe they were looking for a different sound for themselves...